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选修9《Using LanguageⅡ》集体备课PPT课件优质课下载
Over time, many flowering plants and their animal pollinators have evolved together. The plant needs the animal to pollinate it and the animal is rewarded with food called nectar when it visits the flowers.
Reading and discussing
FLOWERS ANDTHEIR ANIMAL POLLINATORS
Pollen becomes attached to the animal during its visit to a flower and is then passed on to another plant's blossom on its next visit. So pollination takes place, therefore increasing the chances of the survival of the plant species. Through evolution, most flowers have adapted to attract specific type of pollinators. Bees, moths and butterflies are the most important pollinators. Flies, wasps, beetles and other animals such as birds and bats are less common.
The type of pollinator depends on the characteristics of the flower such as its colour, shape, size and smell. For example, yellow flowers attract bees, while red flowers attract butterflies. The nectar in some flowers can only be reached by a bird with a long bill or a long-tongued moth or butterfly
What is the text about?
1
The text is about flowers and their animal pollinators.
Answer the questions.
1. What is the advantage for animals of visiting flowers?
Animals get food called nectar from the flowers.
2. Why do some plants need animals?
Some plants need animals to pollinate them.
3. How does an animal pollinate a flower?
An animal pollinates a flower by collecting pollen from a flower and passing it onto another flower.
4. What features of a flower are important in attracting animal pollinators?
The features of a flower that are important in attracting animal pollinators are its colour, shape, size and smell.
5. What is nectar?
Nectar is a sweet liquid produced by flowers and collected by bees.
6. What kinds of animals are most flowers pollinated by?
Most flowers are pollinated by bees, moths and butterflies.
True or false
1. Bees follow coloured lines to the nectar inside the flower.
2. Flowers that are white or pale can be seen by night pollinators.
3. Butterflies are attracted to sweet-smelling flowers.